@H0h0h0: In order to enter Recovery Mode, you will need to connect to a home computer via USB, then press and hold the Volume Up and Power buttons together until the Samsung logo appears on screen, then release. If the Power button is not functional then sadly it won't be possible to complete the steps outlined above. In this instance, please visit samsung.com > Scroll to the bottom of the page > Contact us, and get in touch via your preferred channel, and an advisor will be able to arrange for the phone to be inspected by an engineer under warranty.
